NonExemptAttributeMap

The non-exempt attributes in a relationship key. It is designed for (fast) value equality, thus supporting fast value equality for relationship keys.

Equality of non-exempt attributes is sensitive. Why?

• Attributes can be default or fixed attributes, according to the corresponding schema.

• Attributes have types, so equality should take their types into account.

• Some attributes, such as the "order" attribute, are implicitly always there, even if the schema does not say so.